"The plain and simple truth is that alcohol fuels violent behavior and marijuana does not ... alcohol contributes to literally millions of acts of violence in the United States each year. It is a major contributing factor to crimes like domestic violence, sexual assault, and homicide. Marijuana use, on the other hand, is absent in that regard from both crime reports and the scientific literature. There is simply no causal link to be found."
Former Seattle Police Chief Norm Stamper, from the foreword to Marijuana is Safer: So Why Are We Driving People to Drink?, 2009

"Marijuana in its natural form is one of the safest therapeutically active substances known to man. By any measure of rational analysis marijuana can be safely used within a supervised routine of medical care. ... It would be unreasonable, arbitrary and capricious for DEA to continue to stand between those sufferers and the benefits of this substance in light of the evidence in this record."
DEA Chief Administrative Law Judge Francis L. Young, Ruling in the matter of Marijuana Rescheduling Petition, September 6, 1988

"There is no logical basis for the prohibition of marijuana."
Economist Milton Friedman, Costs of Marijuana Prohibition, June 2, 2005